Referrer means the HTTP referrer. Whenever you click a link, the referring page (previous page you were on) is sent as well. So that means in Long Range Bullet's site there was a link to my site and someone clicked it.

Search query are the keywords from search engines like google, yahoo and such. If you notice the search engines uses the GET method so the keywords used in the search are shown in the URL after the ?. Just like the referrer, the server reads this and separates it for me. So for the search query, lots of people went to a search engine like Google and typed in "zero type forum" and click the link to get to my site. And what makes that particular query interesting is it shows that a lot of people don't bookmark